N21.1 Calculus in urethra

Billable ICD-10-CM code, FY2026.

Excludes2 (not included here)

• calculus of prostate (N42.0)

Applies from N21 Calculus of lower urinary tract

Includes

• calculus of lower urinary tract with cystitis and urethritis

MS-DRG index

Defines the logic of DRG(s) 693-694 in MDC 11.

Approximate ICD-9-CM (GEMs)

• 594.2 Calculus in urethra

Diagnosis Index entries for N21.1

• Calculus, calculi, calculous › urethra (impacted)
• Colic (bilious) (infantile) (intestinal) (recurrent) (spasmodic) › urethral › due to calculus
• Stone (s) › urethra (impacted)
• Urethritis (anterior) (posterior) › calculous
• Urethrolithiasis (with colic or infection)

Nearby codes

• N21 Calculus of lower urinary tract
• N21.0 Calculus in bladder
• N21.1 Calculus in urethra (this code)
• N21.8 Other lower urinary tract calculus
• N21.9 Calculus of lower urinary tract, unspecified